The people on this thread never leave anyone hanging! Bee, as always you are a pearl! I think when I'm explaining this I need to do a better job of stressing just what you stressed - bringing that pad down to the chicks and then adjusting it by bending the frame as they grow. I thought I had done that when I initially started the thread. I deliberately make my frame lower in the back than in the front - those that want a little extra heat get it by going to the back of the cave up against the top of the cave, those that are fine with less tend to stay to the front where the pad is a little further away from them. On the other hand I hate to discourage a little innovation and using what's on hand. I would still be using a heat lamp and brooding chicks for 8 weeks the house otherwise if I'd been easily discouraged and dissuaded.
I also have to be firm enough to say, "That simply will not work" when I know it won't.
So onward and upward.....Dandilioness, let's see those babies in their new cave! And good for you for being receptive to corrections and suggestions!